Cosmetic brush

ABSTRACT

A cosmetic brush, including: a main body; a front cover; a rear cover; a brush assembly; and a piston. The main body includes a front part, a rear part, and a liquid storage cavity disposed between the front part and the rear part. The brush assembly is disposed in the front part. The piston is disposed in the rear part. The brush assembly and the piston are disposed at two ends of the liquid storage cavity, respectively. The rear cover is rotatably disposed relative to the main body. The rear cover is provided with a rear cover sleeve, and the rear cover sleeve is fixed on the rear cover. The rear cover includes a threaded rod and a plurality of threaded sleeves. The plurality of threaded sleeves is telescopic and is hinged to one another via screw threads.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of International Patent Application No. PCT/CN2016/103482 with an international filing date of Oct. 27, 2016, designating the United States, now pending, and further claims foreign priority benefits to Chinese Patent Application No. 201620511966.6 filed May 31, 2016. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications should be directed to: Matthias Scholl P. C., Attn.: Dr. Matthias Scholl Esq., 245 First Street, 18th Floor, Cambridge, Mass. 02142.

BACKGROUND

This disclosure relates to a cosmetic brush.

As shown in FIG. 1, a conventional cosmetic brush includes a main body 1, a front cover 2, and a rear cover 8. The main body 1 includes a liquid storage cavity 3 disposed between the front cover 2 and the rear cover 8. The cosmetic brush further includes a liquid conveying pipe 4, a brush hair 5, and a brush sleeve 6. A piston 7 is disposed in the liquid storage cavity 3. A threaded rod 10 is disposed in the rear cover 8 and connects to the piston 7. When in use, the rear cover 8 is rotated to drive the threaded rod 10. The threaded rod 10 pushes the piston to move in the liquid storage cavity 3 to push the cosmetic liquid to flow to the liquid conveying pipe 4. To ensure the full use of the cosmetic liquid, the moving distance B of the threaded rod 10 must be greater than the length A of the liquid storage cavity 3. This reduces the storage capacity of the liquid storage cavity 3.

SUMMARY

Disclosed is a cosmetic brush that has a relatively large material storage capacity.

Disclosed is a cosmetic brush, comprising: a main body; a front cover; a rear cover; a brush assembly; and a piston. The main body comprises a front part, a rear part, and a liquid storage cavity disposed between the front part and the rear part. The front cover is disposed on the front part and the rear cover is disposed on the rear part; the brush assembly is disposed in the front part; the piston is disposed in the rear part; the brush assembly and the piston are disposed at two ends of the liquid storage cavity, respectively; the rear cover is rotatably disposed relative to the main body; the rear cover is provided with a rear cover sleeve, and the rear cover sleeve is fixed on the rear cover; the rear cover comprises a threaded rod and a plurality of threaded sleeves; the plurality of threaded sleeves is telescopic and is hinged to one another via screw threads, and comprises an innermost threaded sleeve and an outermost threaded sleeve; the threaded rod comprises a first end and a second end; the first end of the threaded rod abuts against the piston, and the second end of the threaded rod is in threaded connection to the innermost threaded sleeve; the outermost threaded sleeve is in threaded connection to the rear cover; and the outermost threaded rod comprises a plurality of axially-distributed grooves, and the rear cover comprises a plurality of axially-distributed ribs corresponding to the grooves; the outermost threaded rod is engaged with the rear cover via the grooves and ribs.

The piston can comprise a polygonal depression; the first end of the threaded rod can comprise a polygonal terminal corresponding to the polygonal depression; the polygonal terminal can be inserted and clamped in the polygonal depression.

The brush assembly can comprise: a liquid conveying pipe communicating with the liquid storage cavity, a brush hair encircling the liquid conveying pipe, and a brush sleeve sleeving the brush hair.

The second end of the threaded rod can comprise a first protruding connector comprising first external screws; the inner surface of the threaded sleeve can comprise first internal screws corresponding to the first external screws.

The threaded sleeve can comprise a second protruding connector comprising second external screws; the inner surface of the rear cover can comprise second internal screws corresponding to the second external screws.

The rear cover can comprise a plurality of circumferentially-disposed ratchets; and the ratchets can be disposed between the main body and the rear cover.

Advantages of the cosmetic brush according to embodiments of the disclosure are summarized as follows. The threaded sleeves of the cosmetic brush occupy less space and have relatively large extension distance. The storage capacity of the cosmetic brush is increased. The use efficiency of the cosmetic material is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a cosmetic brush in the related art;

FIG. 2 is a schematic diagram of a cosmetic brush as described in the disclosure;

FIG. 3 is a sectional view taken from line in FIG. 2;

FIG. 4 shows a use state of a cosmetic brush as described in the disclosure;

FIG. 5 shows another use state of a cosmetic brush as described in the disclosure;

FIG. 6 is a top view of a piston of a cosmetic brush as described in the disclosure;

FIG. 7 is a sectional view of a threaded rod of a cosmetic brush as described in the disclosure;

FIG. 8 is an enlarged view of part VIII in FIG. 7;

FIG. 9 is a sectional view of a threaded sleeve of a cosmetic brush as described in the disclosure;

FIG. 10 is an enlarged view of part X in FIG. 9;

FIG. 11 is an enlarged view of part XI in FIG. 9;

FIG. 12 is a schematic diagram of a rear cover of a cosmetic brush as described in the disclosure; and

FIG. 13 is an enlarged view of part XIII in FIG. 12;

In the drawings, the following reference numbers are used: 1. Main body; 2. Front cover; 3. Liquid storage cavity; 4. Liquid conveying pipe; 5. Brush hair; 6. Brush sleeve; 7. Piston; 8. Rear cover; 9. Rear cover sleeve; 10. Threaded rod; 11. Threaded sleeve; 12. First protruding connector; 13. First external screw. 14. First internal screw; 15. Second protruding connector; 16. Second external screw. 17. Second internal screw; 18. Depression; 19. Terminal; 20. Ratchet.

DETAILED DESCRIPTION

To further illustrate, examples detailing a cosmetic brush are described below. It should be noted that the following examples are intended to describe and not to limit the description.

As shown in FIGS. 2-13, a cosmetic brush comprises a main body 1, a front cover 2, a rear cover, a brush assembly, a piston 7. The main body 1 comprises a front part and a rear part. The front cover is disposed on the front part and the rear cover is disposed on the rear part. The main body 1 comprises a liquid storage cavity 3 (the capital letter A represents the length of the liquid storage cavity) disposed between the front part and the rear part. The brush assembly is disposed in the front part. The piston 7 is disposed in the rear part. The brush assembly and the piston are disposed at two ends of the liquid storage cavity 3, respectively. The rear cover 8 is rotatably disposed relative to main body 1. The rear cover 8 is provided with a rear cover sleeve 9. The rear cover sleeve 9 is fixed on the rear cover 8 axially and radially.

The rear cover 8 comprises a threaded rod 10 and at least one threaded sleeve. The threaded rod comprises a first end and a second end. The threaded sleeve can be one or more as needed. The first end of the threaded rod abuts against the piston, and the second end of the threaded rod is in threaded connection to the at least one threaded sleeve. When a plurality of threaded sleeves is provided, the threaded sleeves are telescopic and are hinged to one another via screw threads, and the second end of the threaded rod is in threaded connection to the innermost threaded sleeve. The outermost threaded sleeve is in threaded connection to the rear cover. The at least one threaded sleeve is unable to rotate along with the rear cover circumferentially.

The outermost threaded rod comprises a plurality of axially-distributed grooves (not shown in the figures), and the rear cover comprises a plurality of axially-distributed ribs (not shown in the figures) corresponding to the grooves. This prevents the rotation of the at least one threaded sleeve along with the rear cover circumferentially. The piston comprises a polygonal depression 18. The first end of the threaded rod comprises a polygonal terminal 19 corresponding to the polygonal depression 18. The polygonal terminal 19 is inserted and clamped in the polygonal depression 18, thus preventing the threaded rod from revolving on its axis circumferentially. The threaded rod can only move axially.

The brush assembly comprises a liquid conveying pipe 4 communicating with the liquid storage cavity, a brush hair 5 encircling the liquid conveying pipe, and a brush sleeve 6 sleeving the brush hair. Optionally, the brush assembly can be in other forms, for example, comprise an applicator.

The second end of the threaded rod comprises a first protruding connector 12 comprising first external screws 13; the inner surface of the threaded sleeve comprises first internal screws 14 (the capital letter C represents the axial length of the first internal screws) corresponding to the first external screws 13. The threaded rod engages with the threaded sleeve via the first external screws and the first internal screws.

The threaded sleeve comprises a second protruding connector 15 comprising second external screws 16; the inner surface of the rear cover comprises second internal screws 17 (the capital letter B represents the axial length of the second internal screws) corresponding to the second external screws 16. The threaded sleeve engages with the rear cover via the second external screws and the second internal screws.

The rear cover 8 comprises a plurality of circumferentially-disposed ratchets 20. The ratchets 20 are disposed between the main body and the rear cover, and can prevent the rear cover from rotating reversely.

When in use, clockwise rotate the rear cover sleeve 9, the rear cover 8 rotates with the rear cover sleeve 9, and the threaded sleeve 11 and the threaded rod 10 move in the rear cover to push the piston to move in the liquid storage cavity 3, as shown in FIG. 4. The cosmetic liquid is squeezed out. When the moving distance of the piston equals to the length B of the second internal screws of the rear cover, the piston temporarily stops moving. Continue clockwise rotating the rear cover sleeve 9, the threaded sleeve 11 rotates synchronously, the threaded rod 10 moves axially in the threaded sleeve 11, to push the piston to continue moving in the liquid storage cavity 3 until the moving distance of the piston reaches the length C of the first internal screws 14 of the threaded sleeve, as shown in FIG. 5. Thus, the cosmetic liquid is completely squeezed out.

Optionally, the threaded sleeve can be one or more. When two or three threaded sleeves are employed, compared with conventional cosmetic brushes with the same height and diameters as that of the cosmetic brush of the embodiment, the threaded sleeves of the cosmetic brush of the embodiment occupy less space but have larger extension distance, so that the storage capacity of the cosmetic brush is greatly increased.

It will be obvious to those skilled in the art that changes and modifications may be made, and therefore, the aim in the appended claims is to cover all such changes and modifications. 

What is claimed is:
 1. A cosmetic brush, comprising: a main body, the main body comprising a front part, a rear part, and a liquid storage cavity disposed between the front part and the rear part; a front cover; a rear cover; a brush assembly; and a piston; wherein: the front cover is disposed on the front part and the rear cover is disposed on the rear part; the brush assembly is disposed in the front part; the piston is disposed in the rear part; the brush assembly and the piston are disposed at two ends of the liquid storage cavity, respectively; the rear cover is rotatably disposed relative to the main body; the rear cover is provided with a rear cover sleeve, and the rear cover sleeve is fixed on the rear cover; the rear cover comprises a threaded rod and a plurality of threaded sleeves; the plurality of threaded sleeves is telescopic and is hinged to one another via screw threads, and comprises an innermost threaded sleeve and an outermost threaded sleeve; the threaded rod comprises a first end and a second end; the first end of the threaded rod abuts against the piston, and the second end of the threaded rod is in threaded connection to the innermost threaded sleeve; the outermost threaded sleeve is in threaded connection to the rear cover; and the outermost threaded rod comprises a plurality of axially-distributed grooves, and the rear cover comprises a plurality of axially-distributed ribs corresponding to the grooves; the outermost threaded rod is engaged with the rear cover via the grooves and ribs.
 2. The brush of claim 1, wherein the piston comprises a polygonal depression; the first end of the threaded rod comprises a polygonal terminal corresponding to the polygonal depression; the polygonal terminal is inserted and clamped in the polygonal depression.
 3. The brush of claim 1, wherein the brush assembly comprises: a liquid conveying pipe communicating with the liquid storage cavity, a brush hair encircling the liquid conveying pipe, and a brush sleeve sleeving the brush hair.
 4. The brush of claim 1, wherein the second end of the threaded rod comprises a first protruding connector comprising first external screws; an inner surface of the threaded sleeve comprises first internal screws corresponding to the first external screws.
 5. The brush of claim 1, wherein the threaded sleeve comprises a second protruding connector comprising second external screws; an inner surface of the rear cover comprises second internal screws corresponding to the second external screws.
 6. The brush of claim 1, wherein the rear cover comprises a plurality of circumferentially-disposed ratchets; and the ratchets are disposed between the main body and the rear cover. 